Many countries do.
If I cross the border into the USA (a 15 minute drive on a good day) and say that I'm picking up something photographic the US border officials will often question me carefully about my intentions, because:
1) If they think I am working as a photographer when I am in the USA (including shooting stock, or on spec) they will exclude me from the country, unless I have obtained the necessary Visa/permit ahead of time; and
2) If they think that I am acquiring commercial goods from the USA, for import to Canada, I also need to prepare the appropriate commercial export paperwork.
Having high-end equipment when you travel raises suspicion - expect them to try to find your web presence.